I bought an ex-social housing flat in London a few years ago, and my freeholder is a housing association, though not the one you alluded to.
My flat is in a block of mixed housing, roughly a third private and the rest social housing, on a small estate.
It's been a mixed bag but I'll share my experience in case it's useful background.
My neighbours are lovely and I have never had any issues with noise in my block. It's a bit hit and miss though - some neighbours in other blocks have had issues with nightmare neighbours and the housing association can be slow to deal with these issues.
Our biggest stress was a major works bill (section 20) that arrived about a year after I moved in. It hadn't come up in conveyancing and my estimate for the bill (still not received as works only just ending) is £25k. A group of us are contesting etc, but the reality is that as a leaseholder you are at the mercy of the freeholder who can basically say what they want to do re: major work.
I would say that your DS should ask:
- when was the roof replaced?
- what's the brickwork like?
- will he get charged a portion of things like drain repairs? how are these allocated? Eg if tenant upstairs flushes nappy down the loo, is that classed as 50/50 cost to your DS or 100% to HA on blame basis?
- what , if any, major works have been done or are planned, what cycle do these happen in (e.g. ours are every 7 years)
- what policy does the HA have re: antisocial behaviour? E.g. would they evict a problem tenant above your DS?
- what's the service charge? Does it include a sinking fund? (better if it does)
- what's the process for repairs?
- can you see the service charge history/bills for the last ten years - this will give you an idea of what they are spending money on. If they haven't done any work this should raise alarm bells as the house could be in a poor condition
- who owns the windows to the flat? If your DS then he will be responsible for repair/replacing them. if the HA be aware they could replace and then charge (this happened to some of my neighbours who were charged £17k for small two bed flat with 6 sash windows)
I'd also suggest googling the HA to find out how good they are at dealing with repairs. My HA is pretty terrible.
I wouldn't say don't do it, just go into it with an open mind. Prevoius posters saying avoid social housing are being snobbish and rude about people! There are idiots in every type of housing.
Hope that helps.